The current .gitignore file content is just like below, and you can add this repo as a upstream **
## .gitignore for Grails 1.2 and 1.3
# .gitignore for maven
target/
*.releaseBackup
# web application files
#/web-app/WEB-INF
# IDE support files
/.classpath
/.launch
/.project
/.settings
/*.launch
/*.tmproj
/ivy*
/eclipse
# default HSQL database files for production mode
/prodDb.*
# general HSQL database files
*Db.properties
*Db.script
# logs
/stacktrace.log
/test/reports
/logs
*.log
*.log.*
# project release file
/*.war
# plugin release file
/*.zip
/*.zip.sha1
# older plugin install locations
/plugins
/web-app/plugins
/web-app/WEB-INF/classes
# "temporary" build files
target/
out/
build/
# other
*.iws
#.gitignore for java
*.class
# Package Files #
*.jar
*.war
*.ear
## .gitignore for eclipse
*.pydevproject
.project
.metadata
bin/**
tmp/**
tmp/**/*
*.tmp
*.bak
*.swp
*~.nib
local.properties
.classpath
.settings/
.loadpath
# External tool builders
.externalToolBuilders/
# Locally stored "Eclipse launch configurations"
*.launch
# CDT-specific
.cproject
# PDT-specific
.buildpath
## .gitignore for intellij
*.iml
*.ipr
*.iws
.idea/
## .gitignore for linux
.*
!.gitignore
!.gitattributes
!.editorconfig
!.eslintrc
!.travis.yml
*~
## .gitignore for windows
# Windows image file caches
Thumbs.db
ehthumbs.db
# Folder config file
Desktop.ini
# Recycle Bin used on file shares
$RECYCLE.BIN/
## .gitignore for mac os x
.DS_Store
.AppleDouble
.LSOverride
Icon
# Thumbnails
._*
# Files that might appear on external disk
.Spotlight-V100
.Trashes
## hack for graddle wrapper
!wrapper/*.jar
!**/wrapper/*.jar